Marching and playing an instrument is a difficult thing to do. It requires lots of concentration and patience. In air cadets you go through lots of drill and you need to know angles for it. Sometimes the commands would call for a 45 degree and and sometimes a 180 degree angle. There are also salutes in cadets and they also have to be in an angle so there is even angles and math involved in marching and drill. Here is a video clip of the drill team